[Makefile] don't include manifest when creating manifest

Makefile

diff --git a/Makefile b/Makefile
index 60af834..1cb30e5 100644
--- a/Makefile
+++ b/Makefile
@@ -136,7 +136,7 @@
 .RECIPE: manifest
 manifest:
 	cd verilog/rtl/ && \
-	find * -type f ! -name "user_*.v" ! -name "README" ! -name "defines.v" -exec shasum {} \; > manifest
+	find * -type f ! -name "user_*.v" ! -name "manifest" ! -name "README" ! -name "defines.v" -exec shasum {} \; > manifest
 
 check-env:
 ifndef PDK_ROOT

verilog/rtl/manifest

diff --git a/verilog/rtl/manifest b/verilog/rtl/manifest
index 9368b61..11c820a 100644
--- a/verilog/rtl/manifest
+++ b/verilog/rtl/manifest
@@ -13,7 +13,6 @@
 1898b82b348087ab19df11fcf5fb15973bd4dcb4  gpio_wb.v
 339a4eb821b5aaecdb66156ec2f94afb1bb6222b  housekeeping_spi.v
 37b86bdee00effa1dabb54f5e11d684b0eb4e0c4  la_wb.v
-e99f14f5ba1e805e463fda03e5bc50b261bf3148  manifest
 7e3130f7c5ad489917a4c1fc7a3c78faf188e210  mem_wb.v
 a8ae0a27e4d5cb5d8074abba260c1d0331f6fdb9  mgmt_core.v
 d4812358137bde6386ca760dcb217ec9dde71093  mgmt_protect.v